Replace more ObserverList with base::ObserverList.

content/browser/dom_storage/dom_storage_context_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_CONTEXT_IMPL_H_
 #define CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_CONTEXT_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 187 matching lines @@
 
   // Where sessionstorage data is stored, maybe empty for the incognito use
   // case. Always empty until the file-backed session storage feature is
   // implemented.
   base::FilePath sessionstorage_directory_;
 
   // Used to schedule sequenced background tasks.
   scoped_refptr<DOMStorageTaskRunner> task_runner_;
 
   // List of objects observing local storage events.
-  ObserverList<EventObserver> event_observers_;
+  base::ObserverList<EventObserver> event_observers_;
 
   // We use a 32 bit identifier for per tab storage sessions.
   // At a tab per second, this range is large enough for 68 years.
   // The offset is to more quickly detect the error condition where
   // an id related to one context is mistakenly used in another.
   base::AtomicSequenceNumber session_id_sequence_;
   const int session_id_offset_;
 
   bool is_shutdown_;
   bool force_keep_session_state_;
   scoped_refptr<storage::SpecialStoragePolicy> special_storage_policy_;
   scoped_refptr<SessionStorageDatabase> session_storage_database_;
 
   // For cleaning up unused namespaces gradually.
   bool scavenging_started_;
   std::vector<std::string> deletable_persistent_namespace_ids_;
 
   // Persistent namespace IDs to protect from gradual deletion (they will
   // be needed for session restore).
   std::set<std::string> protected_persistent_session_ids_;
 
   // Mapping between persistent namespace IDs and namespace IDs for
   // sessionStorage.
   std::map<std::string, int64> persistent_namespace_id_to_namespace_id_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_CONTEXT_IMPL_H_